Lighting fixture



FIG. 1 is a persepctive view of a lighting fixture showing my new design;

FIG. 2 is a side elevational view thereof, all sides being identical, except for the orientation of the ring;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a lighting fixture, as shown and described. 